Hall Element Tool Orientation Detection in MRI Systems
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Solution Overview
Problem
Conventional magnetic resonance systems with Hall elements lack sufficient precision in determining the orientation of tools relative to the basic magnetic field, limiting their application in certain scenarios.
Innovation Solution
The use of multiple Hall elements with distinct orientations, connected to an evaluation device, allows for more precise determination of tool orientation by transmitting binary signals, enabling improved angle resolution and orientation precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single Hall element is used to detect tool orientation, then the device complexity is low, but the measurement precision of tool orientation is insufficient
Solution Approach 1:
The detection function is segmented into multiple Hall elements with different element directions. Instead of using one Hall element to detect all orientation information, the patent divides the detection task among multiple Hall elements (at least two), each sensitive to different spatial components of the basic magnetic field. This segmentation enables precise determination of tool orientation by combining information from multiple directional sensors.
2Measurement precision
If multiple Hall elements with different element directions are used, then the angle resolution in the rotation plane is improved, but the device complexity increases
Solution Approach 1:
Each Hall element is assigned a specific element direction optimized for detecting particular components of the basic magnetic field. The patent configures Hall elements with different local orientations (e.g., perpendicular to each other) to capture different spatial information. This local quality differentiation allows the system to achieve high angle resolution in the rotation plane by combining measurements from elements with distinct directional sensitivities.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances the precision of tool orientation determination, allowing for more accurate positioning and operation modes in magnetic resonance systems, particularly by achieving greater angle resolution in the rotation plane and precise octant determination.
Implementation Method 1
a Hall element that emits a binary signal that characterizes whether the basic magnetic field has a component that, relative to an element direction of the Hall element, is greater than a threshold
Data Source
AI summary
A magnetic resonance system has a basic field magnet that generates a static basic magnetic field that is essentially homogeneous within an examination volume, the basic magnetic field having a basic direction. At least one tool can be inserted into the examination volume and can be removed from it. The at least one tool has a number of Hall elements. Each Hall element of the at least one tool is fashioned such that a binary signal emitted by said Hall element characterizes whether the basic magnetic field has a component that, relative to a respective element direction of the respective Hall element, is greater than a threshold. The respective element directions of the respective Hall elements differ from one another in pairs. The Hall elements of the at least one tool communicate in terms of data with an evaluation device of the magnetic resonance system to transmit the binary signal that it emits. The evaluation device uses the transmitted binary signal to determine an orientation of the at least one tool relative to the basic direction and takes additional measures depending on this orientation.